As always, good management depends on proper application timing in relation to weed size. A. Yes, but you need irrigation to make this work at peak performance. The yellow herbicides are prone to degradation from sunlight if it lays on the soil surface for more than a few days. Both the Prowl H20 (pendimethalin) and Sonalan (ethalfluralin) labels suggest that incorporation should occur within 48 hours of application.Tillage has traditionally been used to incorporate these herbicides into the soil with excellent results. However, the Valor (flumioxazin) label clearly states that mechanical incorporation will reduce the activity of this herbicide.
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